sar -n DEV 1 40 -o sar.net.$1.bin > /dev/null &
sar -u 1 40 -o sar.cpu.$1.bin
sar -u 1 -f sar.cpu.$1.bin > sar.cpu.$1.txt
sar -n DEV 1 -f sar.net.$1.bin > sar.net.$1.txt
